/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.pos.net.toolbox;

import com.pos.net.base.AuthFailureError;
import com.pos.net.base.Request;
import com.pos.net.base.Request.Method;
import com.pos.net.https.HTTPSTrustManager;
import com.pos.net.request.load.MultiPartRequest;
import com.pos.net.request.load.UploadMultipartEntity;
import com.pos.set.Log;

import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.ProtocolVersion;
import org.apache.http.StatusLine;
import org.apache.http.entity.BasicHttpEntity;
import org.apache.http.message.BasicHeader;
import org.apache.http.message.BasicHttpResponse;
import org.apache.http.message.BasicStatusLine;

import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLSocketFactory;

/**
 * An {@link HttpStack} based on {@link HttpURLConnection}.
 */
public class HurlStack implements HttpStack {

	/**
	 * An interface for transforming URLs before use.
	 */
	public interface UrlRewriter {
		/**
		 * Returns a URL to use instead of the provided one, or null to indicate
		 * this URL should not be used at all.
		 */
		public String rewriteUrl(String originalUrl);
	}

	private final UrlRewriter mUrlRewriter;
	private final SSLSocketFactory mSslSocketFactory;
	private final String mUserAgent;

	public HurlStack() {
		this(null);
	}

	public HurlStack(String userAgent) {
		this(null, userAgent);
	}

	/**
	 * @param urlRewriter
	 *            Rewriter to use for request URLs
	 */
	public HurlStack(UrlRewriter urlRewriter, String userAgent) {
		this(urlRewriter, null, userAgent);
	}

	/**
	 * @param urlRewriter
	 *            Rewriter to use for request URLs
	 * @param sslSocketFactory
	 *            SSL factory to use for HTTPS connections
	 */
	public HurlStack(UrlRewriter urlRewriter, SSLSocketFactory sslSocketFactory, String userAgent) {
		mUrlRewriter = urlRewriter;
		mSslSocketFactory = sslSocketFactory;
		mUserAgent = userAgent;
	}

	@Override
	public HttpResponse performRequest(Request<?> request, Map<String, String> additionalHeaders)
			throws IOException, AuthFailureError {
		String url = request.getUrl();
		HashMap<String, String> map = new HashMap<String, String>();
		// chenbo add gzip support,new user-agent
		if (request.isShouldGzip()) {
			map.put(HEADER_ACCEPT_ENCODING, ENCODING_GZIP);
		}
		map.put(USER_AGENT, mUserAgent);
		// end
		map.putAll(request.getHeaders());
		map.putAll(additionalHeaders);
		if (mUrlRewriter != null) {
			String rewritten = mUrlRewriter.rewriteUrl(url);
			if (rewritten == null) {
				throw new IOException("URL blocked by rewriter: " + url);
			}
			url = rewritten;
		}
		URL parsedUrl = new URL(url);
		HttpURLConnection connection = openConnection(parsedUrl, request);
		for (String key : map.keySet()) {
			Log.e("遍历 最后结果HurlStack map", "检查是否存在Set-Cookie");
			if ("Set-Cookie".equals(key))

				Log.e("遍历 最后结果HurlStack map", "key= " + key + " and value= " + map.get(key));

		}

		for (String headerName : map.keySet()) {
			// connection.addRequestProperty(headerName, map.get(headerName));
			connection.setRequestProperty(headerName, map.get(headerName));
		}

		// if (request instanceof MultiPartRequest) {
		// setConnectionParametersForMultipartRequest(connection, request);
		// } else {
		// }
		setConnectionParametersForRequest(connection, request);

		// Initialize HttpResponse with data from the HttpURLConnection.
		ProtocolVersion protocolVersion = new ProtocolVersion("HTTP", 1, 1);
		int responseCode = connection.getResponseCode();
		if (responseCode == -1) {
			// -1 is returned by getResponseCode() if the response code could
			// not be retrieved.
			// Signal to the caller that something was wrong with the
			// connection.
			throw new IOException("Could not retrieve response code from HttpUrlConnection.");
		}
		StatusLine responseStatus = new BasicStatusLine(protocolVersion, connection.getResponseCode(),
				connection.getResponseMessage());
		BasicHttpResponse response = new BasicHttpResponse(responseStatus);
		response.setEntity(entityFromConnection(connection));
		for (Entry<String, List<String>> header : connection.getHeaderFields().entrySet()) {

			if ("Set-Cookie".equals(header.getKey())) {
				Log.e("hurlStack", "第一次结果获取HurlStack Set-Cookie  header.getKey()=" + header.getKey()
						+ ",header.getValue()=" + header.getValue());
				StringBuilder sb = new StringBuilder();
				for (int i = 0; i < header.getValue().size(); i++) {
					sb.append(header.getValue().get(i));
				}

				Header h = new BasicHeader(header.getKey(), sb.toString());
				response.addHeader(h);
			} else {
				if (header.getKey() != null) {
					Header h = new BasicHeader(header.getKey(), header.getValue().get(0));
					response.addHeader(h);
				}
			}

			// if (header.getKey() != null) {
			// Header h = new BasicHeader(header.getKey(),
			// header.getValue().get(0));
			// response.addHeader(h);
			// }
		}
		if (ENCODING_GZIP.equalsIgnoreCase(connection.getContentEncoding())) {
			response.setEntity(new InflatingEntity(response.getEntity()));
		}
		return response;
	}

	/**
	 * Initializes an {@link HttpEntity} from the given
	 * {@link HttpURLConnection}.
	 * 
	 * @param connection
	 * @return an HttpEntity populated with data from <code>connection</code>.
	 */
	private static HttpEntity entityFromConnection(HttpURLConnection connection) {
		BasicHttpEntity entity = new BasicHttpEntity();
		InputStream inputStream;
		try {
			inputStream = connection.getInputStream();
		} catch (IOException ioe) {
			inputStream = connection.getErrorStream();
		}
		entity.setContent(inputStream);
		entity.setContentLength(connection.getContentLength());
		entity.setContentEncoding(connection.getContentEncoding());
		entity.setContentType(connection.getContentType());

		return entity;
	}

	/**
	 * Create an {@link HttpURLConnection} for the specified {@code url}.
	 */
	protected HttpURLConnection createConnection(URL url) throws IOException {
		// return (HttpURLConnection) url.openConnection();
		if (url.toString().contains("https")) {
			HTTPSTrustManager.allowAllSSL();
		}
		return (HttpURLConnection) url.openConnection();
	}

	/**
	 * Opens an {@link HttpURLConnection} with parameters.
	 * 
	 * @param url
	 * @return an open connection
	 * @throws IOException
	 */
	private HttpURLConnection openConnection(URL url, Request<?> request) throws IOException {
		HttpURLConnection connection = createConnection(url);

		int timeoutMs = request.getTimeoutMs();
		connection.setConnectTimeout(CONNECTION_TIME_OUT_MS);
		connection.setReadTimeout(timeoutMs);
		connection.setUseCaches(false);
		connection.setDoInput(true);

		// use caller-provided custom SslSocketFactory, if any, for HTTPS
		if ("https".equals(url.getProtocol()) && mSslSocketFactory != null) {
			((HttpsURLConnection) connection).setSSLSocketFactory(mSslSocketFactory);
		}

		return connection;
	}

	@SuppressWarnings("deprecation")
	/* package */ static void setConnectionParametersForRequest(HttpURLConnection connection, Request<?> request)
			throws IOException, AuthFailureError {
		switch (request.getMethod()) {
		case Method.DEPRECATED_GET_OR_POST:
			// This is the deprecated way that needs to be handled for backwards
			// compatibility.
			// If the request's post body is null, then the assumption is that
			// the request is
			// GET. Otherwise, it is assumed that the request is a POST.
			byte[] postBody = request.getPostBody();
			if (postBody != null) {
				// Prepare output. There is no need to set Content-Length
				// explicitly,
				// since this is handled by HttpURLConnection using the size of
				// the prepared
				// output stream.
				connection.setDoOutput(true);
				connection.setRequestMethod("POST");
				connection.addRequestProperty(HEADER_CONTENT_TYPE, request.getPostBodyContentType());
				DataOutputStream out = new DataOutputStream(connection.getOutputStream());
				out.write(postBody);
				out.close();
			}
			break;
		case Method.GET:
			// Not necessary to set the request method because connection
			// defaults to GET but
			// being explicit here.
			connection.setRequestMethod("GET");
			break;
		case Method.DELETE:
			connection.setRequestMethod("DELETE");
			break;
		case Method.POST:
			connection.setRequestMethod("POST");
			addBodyIfExists(connection, request);
			break;
		case Method.PUT:
			connection.setRequestMethod("PUT");
			addBodyIfExists(connection, request);
			break;
		case Method.HEAD:
			connection.setRequestMethod("HEAD");
			break;
		case Method.OPTIONS:
			connection.setRequestMethod("OPTIONS");
			break;
		case Method.TRACE:
			connection.setRequestMethod("TRACE");
			break;
		case Method.PATCH:
			connection.setRequestMethod("PATCH");
			addBodyIfExists(connection, request);
			break;
		default:
			throw new IllegalStateException("Unknown method type.");
		}
	}

	private static void addBodyIfExists(HttpURLConnection connection, final Request<?> request)
			throws IOException, AuthFailureError {
		connection.setDoOutput(true);
		connection.addRequestProperty(HEADER_CONTENT_TYPE, request.getBodyContentType());

		if (request instanceof MultiPartRequest) {
			final UploadMultipartEntity multipartEntity = ((MultiPartRequest<?>) request).getMultipartEntity();
			// 防止所有文件写到内存中
			connection.setFixedLengthStreamingMode((int) multipartEntity.getContentLength());
			multipartEntity.writeTo(connection.getOutputStream());
		} else {
			byte[] body = request.getBody();
			if (body != null) {
				DataOutputStream out = new DataOutputStream(connection.getOutputStream());
				out.write(body);
				out.close();
			}
		}
	}
}
